Proceedings of the Geologists Association最新文献_第2页

The structural setting and geometry of the Faringdon Trough defined by subsurface mapping 通过地下测绘确定法林顿海槽的结构环境和几何形状

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-10-01 DOI: 10.1016/j.pgeola.2024.09.001

Nigel Banks

{"title":"The structural setting and geometry of the Faringdon Trough defined by subsurface mapping","authors":"Nigel Banks","doi":"10.1016/j.pgeola.2024.09.001","DOIUrl":"10.1016/j.pgeola.2024.09.001","url":null,"abstract":"<div><div>Data from over 80 boreholes have been used together with the surface geology to interpret the subsurface structure and stratigraphy of the Corallian to Gault (Upper Jurassic to Lower Cretaceous) sediments in the Vale of the White Horse, between Faringdon and Wantage in West Oxfordshire. The gentle regional dip to the SSE of the sediments in this area is interrupted by two major features. The first is the Faringdon Fault, first defined at outcrop just east of Faringdon. This has been traced SE from the outcrop extent for at least 8 km in the subsurface towards Wantage. It has an estimated maximum downthrow to the SW of <em>ca</em> 40 m. Contrary to previous interpretations, this fault was probably active during Kimmeridge Clay deposition.</div><div>The second feature is the Faringdon Trough, an erosional palaeovalley filled with at least 50 m of marine Lower Greensand sediments. The Trough trends SSE from Faringdon and cuts deeply through the Kimmeridge Clay to reach the underlying Corallian. A subtle structural feature, here named the Baulking Fault, has a throw of <10 m and its movement was probably pre-Cretaceous, but it seems to have influenced the path and geometry of the Faringdon Trough, dividing it into two segments. Contrary to previous interpretations, subsurface mapping suggests that the main Trough has a broad U-shape in cross-section with a planar base where it rests on resistive Corallian limestone. Along its margins depositional dips of up to 9° have been widely recorded in the Lower Greensand sediments.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 5","pages":"Pages 596-612"},"PeriodicalIF":1.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early Miocene lacustrine deposits from the Oued Tilatou Formation (Aurès Massif, Eastern Algeria): Sedimentology, micropalaeontology, and palaeoenvironmental implications 来自 Oued Tilatou 地层（阿尔及利亚东部 Aurès 山丘）的早中新世湖相沉积：沉积学、微古生物学和古环境影响

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-10-01 DOI: 10.1016/j.pgeola.2024.08.003

Somia Khanfer , Fouad Djaiz , Josep Sanjuan , Lucas Silveira Antonietto , Bachir Lamouri , Amine Cherif , Hicham El Asmi , Cameron Manche

{"title":"Early Miocene lacustrine deposits from the Oued Tilatou Formation (Aurès Massif, Eastern Algeria): Sedimentology, micropalaeontology, and palaeoenvironmental implications","authors":"Somia Khanfer , Fouad Djaiz , Josep Sanjuan , Lucas Silveira Antonietto , Bachir Lamouri , Amine Cherif , Hicham El Asmi , Cameron Manche","doi":"10.1016/j.pgeola.2024.08.003","DOIUrl":"10.1016/j.pgeola.2024.08.003","url":null,"abstract":"<div><div>Lacustrine depositional systems provide a valuable record of palaeoenvironmental conditions since they rely on a delicate balance between accommodation space and water-sediment supply controlled by tectonic activity and climatic conditions. This study presents new sedimentological and micropalaeontological information from the early Miocene lacustrine Oued Tilatou Formation, northeastern Algeria. Based on sedimentary facies and microfossil assemblages, the Oued Tilatou Formation (OTF) is divided into two discrete units, the Lower OTF and the Upper OTF. The Lower OTF is characterised by reddish clay-rich carbonate mudstone containing reworked foraminifera and ostracods interspersed by polymodal clast-supported conglomerates attributed to alluvial deposition. The Lower OTF was deposited under fluvial–palustrine conditions, marked by a notable terrigenous sediment influx. In contrast, the Upper OTF encompasses greenish charophyte-dominated (<em>Sphaerochara</em> sp.) carbonate mudstone interbedded with silty carbonate mudstone, and dolomitic wackestone containing charophyte thalli, several ostracod species, and stromatolites. The dominant ostracod taxa within this interval are <em>Mediocypris</em> sp. cf. <em>M. candonaeformis</em>, indicating freshwater–brackish water conditions. The transition in depositional facies from the Lower OTF to the Upper OTF is interpreted as reflecting changes in the environment from fluvial–palustrine to shallow water lacustrine with fluctuation in freshwater input during the Burdigalian (Early Miocene). This study provides new insights on the interplay between early Miocene climate conditions and the tectonic uplift of the Aurès Massif, and their implications for lacustrine palaeoenvironmental conditions.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 5","pages":"Pages 533-544"},"PeriodicalIF":1.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Tithonian (Upper Jurassic) lake shoreline in Buckinghamshire, UK: Evidence from stromatolite distribution in the Purbeck Formation 英国白金汉郡的提托尼（上侏罗统）湖岸线：普贝克地层叠层石分布的证据

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-10-01 DOI: 10.1016/j.pgeola.2024.08.001

Jonathan D. Radley , Robert A. Coram

{"title":"A Tithonian (Upper Jurassic) lake shoreline in Buckinghamshire, UK: Evidence from stromatolite distribution in the Purbeck Formation","authors":"Jonathan D. Radley , Robert A. Coram","doi":"10.1016/j.pgeola.2024.08.001","DOIUrl":"10.1016/j.pgeola.2024.08.001","url":null,"abstract":"<div><div>Stromatolites in the essentially non-marine Purbeck Formation (Tithonian, Upper Jurassic) west of Aylesbury (Buckinghamshire, UK) cap an erosion surface truncating lacustrine–palustrine carbonates, previously documented from an exposure close to the site of the former Bugle Pit, Hartwell. The stromatolite occurrences in this area follow a regional northwest–southeast structural grain, evidenced by local normal faults, some demonstrably active during Late Jurassic–Early Cretaceous time. Observations from associated lithofacies and biota suggest a littoral lacustrine setting for the stromatolite ‘belt’. We hypothesise that the present-day stromatolite distribution reflects a fault-controlled palaeo-shoreline, and that growth of the stromatolites was linked to lacustrine transgression driven by syn-sedimentary movement on these faults. Littoral sand associated with the stromatolites was possibly reworked from older marine sediments undergoing erosion on a nearby fault footwall, or distally, on the western margin of the Anglo-Brabant Massif.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 5","pages":"Pages 518-527"},"PeriodicalIF":1.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microvertebrates from the Lower Greensand Group (Lower Cretaceous) of Clophill, Bedfordshire, UK, and Nutfield, Surrey, UK 英国贝德福德郡 Clophill 和萨里郡 Nutfield 下绿砂岩组（下白垩统）的微脊椎动物

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-10-01 DOI: 10.1016/j.pgeola.2024.07.002

Lila Blake , Max Fursman , Christopher J. Duffin , Trevor Batchelor , Claudia Hildebrandt , Michael J. Benton

{"title":"Microvertebrates from the Lower Greensand Group (Lower Cretaceous) of Clophill, Bedfordshire, UK, and Nutfield, Surrey, UK","authors":"Lila Blake , Max Fursman , Christopher J. Duffin , Trevor Batchelor , Claudia Hildebrandt , Michael J. Benton","doi":"10.1016/j.pgeola.2024.07.002","DOIUrl":"10.1016/j.pgeola.2024.07.002","url":null,"abstract":"<div><div>The Lower Greensand of southern England (early Aptian–early Albian; <em>c.</em>, 120–110 Ma) has yielded diverse faunas of vertebrates, but these have not been reported in detail. Here, we present rich faunas, mainly comprising sharks, bony fishes, and crocodyliforms, from two localities to the north and south of the London–Brabant Massif. The first, Clophill Quarry, near Leighton Buzzard in Bedfordshire, has yielded fossils from the Brown Sands Formation, representing an inshore, tidally influenced environment, such as an estuary mouth. The second, Patteson Court Quarry, Nutfield, Surrey, has produced fossils from the Sandgate Formation (Redhill Sands Member). The faunas of both locations are similar, and they share a remarkable assemblage of at least 23 chondrichthyan taxa, one <em>Edaphodon</em>-like chimaeroid, ten hybodontiform sharks, and 12 neoselachian sharks. The hybodontiform sharks comprise two morphological groups, those with high-cusped piercing teeth, sometimes with lateral cusplets and a coronal ornament of vertical ridges, and those with low-crowned crushing teeth. The 12 species of neoselachian sharks include one representative of the extinct Synechodontiformes, as well as examples of the modern orders Hexanchiformes, Lamniformes, Carchariniformes, Squatiniformes, Heterodontiformes, and Orectolobiformes. Bony fishes are represented mostly by crushing teeth of Pycnodontiformes, Aspidorhynchiformes, Amiiformes, Lepisosteiformes, and Semionotiformes. Crocodyliforms are identified from seven morphotypes of elongate, goniopholid-like teeth. Based on these fossil teeth, the fauna is 53 % chondrichthyan and 21 % osteichthyan; neoselachians represent 32–45 % of the chondrichthyans, lower than figures from the underlying Wealden.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 5","pages":"Pages 493-517"},"PeriodicalIF":1.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Re-assessing the age of the type locality of Nythosaurus larvatus (Therapsida, Cynodontia) and implications on the evolutionary dynamics of cynodonts 重新评估秧鸡龙（Therapsida, Cynodontia）模式产地的年龄及其对秧鸡龙进化动态的影响

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-10-01 DOI: 10.1016/j.pgeola.2024.08.007

J. Benoit, S. Jirah, E.S. Lund, T. Lafferty, V. Buffa, L.A. Norton

{"title":"Re-assessing the age of the type locality of Nythosaurus larvatus (Therapsida, Cynodontia) and implications on the evolutionary dynamics of cynodonts","authors":"J. Benoit, S. Jirah, E.S. Lund, T. Lafferty, V. Buffa, L.A. Norton","doi":"10.1016/j.pgeola.2024.08.007","DOIUrl":"10.1016/j.pgeola.2024.08.007","url":null,"abstract":"<div><div><em>Nythosaurus larvatus</em> was one of the first cynodonts named and, for a long time, the only therapsid for which the endocranial cast was described. The holotype and only skull of this species is thus a landmark in the history of therapsid palaeontology. It is believed to have come from Commissie Drift 303 (Free State Province, South Africa), a locality that has been traditionally dated to the <em>Lystrosaurus declivis</em> Assemblage Zone. However, this age was mostly based on the synonymy between <em>Nythosaurus larvatus</em> and <em>Thrinaxodon liorhinus</em>, the former being the only fossil indisputably reported from this locality and the latter being an index taxon for the <em>Lystrosaurus declivis</em> Assemblage Zone. A recent revision of <em>Nythosaurus larvatus</em> also questioned the age of Commissie Drift. Here, we report the result of our fieldwork to re-assess the age of this locality. We find that the stratigraphy conforms to the lower Burgersdorp Formation and that the fossil tetrapod fauna does not match the <em>Lystrosaurus declivis</em> Assemblage Zone. The overall scarcity of fossil bones, absence of plants and dicynodonts, and relative dominance of amphibian remains all point to an assignation to the <em>Langbergia</em>–<em>Garjainia</em> Subzone of the <em>Cynognathus</em> Assemblage Zone, which is consistent with the stratigraphy. The discovery of new material attributable to cf. <em>Nythosaurus</em> bolsters the notion that this taxon is from the late Olenekian. <em>Nythosaurus larvatus</em> can safely be considered a valid taxon, and may in fact occur elsewhere in this subzone.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 5","pages":"Pages 589-595"},"PeriodicalIF":1.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Significance of the trace fossil Macaronichnus from the Cenomanian low-latitude nearshore deposits of the Saharan Atlas, Algeria 阿尔及利亚撒哈拉阿特拉斯低纬度近岸沉积中的痕量化石 Macaronichnus 的意义

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-08-01 DOI: 10.1016/j.pgeola.2024.05.004

{"title":"Significance of the trace fossil Macaronichnus from the Cenomanian low-latitude nearshore deposits of the Saharan Atlas, Algeria","authors":"","doi":"10.1016/j.pgeola.2024.05.004","DOIUrl":"10.1016/j.pgeola.2024.05.004","url":null,"abstract":"<div><p><span>The Cenomanian<span> deposits of the Eastern Saharan Atlas are characterised by gypsum-dominated series interpreted as coastal sabkha deposits, indicating low-latitude, and tropical to subtropical settings. The evaporitic conditions are interrupted by rapid marine ingressions allowed the deposition of carbonate beds. In the Djebel Ousigna section, fine sandy limestone bed shows abundant burrows of </span></span><em>Macaronichnus</em><span>. These traces indicate the upper shoreface–foreshore contact, affected by storm events, which show similarities with recent huge tsunami waves that facilitated the proliferation of </span><em>Travisia</em> polychaete populations (<em>Macaronichnus</em> tracemaker). This <em>Macaronichnus</em>-suite represents the most proximal marine setting during a regressive phase. Also, this unique occurrence of <em>Macaronichnus</em><span> in the North African Cenomanian low-latitude, subtropical to tropical evaporites<span><span> is interpreted as related to upwelling of cold nutrient rich-waters. The latter seemingly challenge the view that this trace fossil is restricted to colder </span>climatic zones. From an ethological viewpoint, studied </span></span><em>Macaronichnus</em> specimens are considered to be a sequorichnial trace (exploratory behaviour) produced by polychaete annelids.</p></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 4","pages":"Pages 369-376"},"PeriodicalIF":1.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141399840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The filament event, sequence stratigraphy and correlation of recorded bioevents near the Cenomanian–Turonian boundary: Implications in Central Tunisia 丝状事件、层序地层学和仙人掌-土伦边界附近记录的生物事件的相关性：对突尼斯中部的影响

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-08-01 DOI: 10.1016/j.pgeola.2024.05.005

{"title":"The filament event, sequence stratigraphy and correlation of recorded bioevents near the Cenomanian–Turonian boundary: Implications in Central Tunisia","authors":"","doi":"10.1016/j.pgeola.2024.05.005","DOIUrl":"10.1016/j.pgeola.2024.05.005","url":null,"abstract":"<div><p><span>Near the Cenomanian–Turonian boundary, the filament event has been identified worldwide. In Tunisia, filaments are well represented in the laminated black shales of the Bahloul Formation. These black shales were deposited under anoxic conditions in an outer ramp environment. Filaments are particularly abundant in the upper part of the Bahloul Formation, and within the </span><em>W. archaeocretacea</em><span><span><span> Zone; these correspond to the massive occurrence of fragments of thin-shelled bivalves, whether planktic or nektonic. In terms of sequence stratigraphy, two sampled sections in Central and Central-West Tunisia have led to the interpretation of these deposits as a transgressive interval (TST). In the Oued Ettalla area, the organic-rich laminated limestone and the interbedded dark grey marly </span>claystone constitute the Bahloul Member. The transgressive interval ends with a maximum </span>flooding surface (MFS) included within the lower part of the Kef Formation (Annaba Member) which consists of yellowish-grey marly claystone and marly limestone intercalations, rich in filaments. Whilst in the Oued Sfala section the maximum flooding surface (MFS) is characterised by a thin layer of pebbles (approximate centimetric scale) occurring between Unit 4 and Unit 5. Through the analysis of both oxic and anoxic facies from the Cenomanian–Turonian transition, five bioevent markers have been identified in our sections and in other regions within the Tethyan domain: the extinction of the genus </span><em>Rotalipora</em>, the <em>Heterohelix</em> shift, the proliferation of globular planktic foraminifera, the filament event, and the first occurrence of <em>Helvetoglobotruncana helvetica</em>. These bioevents are important for establishing high-resolution correlations both regionally and worldwide.</p></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 4","pages":"Pages 377-388"},"PeriodicalIF":1.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141390791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rock-slope failure scars on sandstone mountains in NW Scotland 苏格兰西北部砂岩山的岩坡崩塌疤痕

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-08-01 DOI: 10.1016/j.pgeola.2024.05.003

Colin K. Ballantyne

{"title":"Rock-slope failure scars on sandstone mountains in NW Scotland","authors":"Colin K. Ballantyne","doi":"10.1016/j.pgeola.2024.05.003","DOIUrl":"10.1016/j.pgeola.2024.05.003","url":null,"abstract":"<div><p>Amongst the most neglected landforms in formerly glaciated mountain environments are the scars of major rock-slope failures where the displaced rock or runout debris has been removed by glacial erosion. The characteristics of 33 such debris-free failure scars (DFFSs) on Torridonian sandstone terrain were analysed. These range from 0.011 to 0.183 km<sup>2</sup> in ground area, and scar volume implies removal of ~0.4–9.9 Mt of rock. Failure planes are planar or stepped at gradients of 37–50°, implying failure as ‘rough’ translational slides; most probably represent former rock avalanches or fragmented rockslides where shear through bedding planes resulted in runout fragmentation. Extension of 85 % to the slope crest is consistent with coseismic triggering during periods of glacio-isostatic crustal uplift. At least ten DFFSs demonstrably pre-date expansion of the last ice sheet at ~35 ka, and at least five probably represent failure that occurred in the Lateglacial interval of ~16–11.7 ka. Fourteen are located within cirques, confirming the importance of RSFs in cirque extension during ice-free interglacials or interstades; others have contributed to trough widening and the formation of arêtes. Older upper-slope cavities in Torridonian mountains are probably also the results of (possibly recurrent) rock-slope failures. It is concluded that the large-scale morphology of the Torridonian sandstone mountains reflects a long-term synergic relationship between alternating episodes of glacial erosion and rock-slope failure: reduction of rock-slope stability during each glacial-deglacial cycle has predisposed slopes to eventual failure, with subsequent glacial removal of displaced blocks and runout debris.</p></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 4","pages":"Pages 355-368"},"PeriodicalIF":1.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0016787824000208/pdfft?md5=d791d011d347d7dc24948d6acecc9a46&pid=1-s2.0-S0016787824000208-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Barthélémy Faujas de Saint-Fond (1741–1819) and his work on pozzolans and lime: A pioneer in sustainable building Barthélémy Faujas de Saint-Fond（1741-1819 年）以及他在合成纤维和石灰方面的研究成果：可持续建筑的先驱

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-08-01 DOI: 10.1016/j.pgeola.2024.04.004

引用次数: 0

The anatomically preserved Early Carboniferous flora of Pettycur, Fife, Scotland 苏格兰法夫地区佩蒂库尔保存完好的早石炭纪植物群

IF 1.2 4区地球科学

Proceedings of the Geologists Association Pub Date : 2024-08-01 DOI: 10.1016/j.pgeola.2024.06.001

Andrew C. Scott

{"title":"The anatomically preserved Early Carboniferous flora of Pettycur, Fife, Scotland","authors":"Andrew C. Scott","doi":"10.1016/j.pgeola.2024.06.001","DOIUrl":"10.1016/j.pgeola.2024.06.001","url":null,"abstract":"<div><p>The Late Viséan (mid-Mississippian) anatomically preserved flora from Pettycur, Fife, Scotland is one of the most significant plant assemblages (lagerstätte) from this period anywhere in the world. It has been known from the later 19th century, mainly from loose limestone blocks found on the beach. Thin sections of limestones showing outstanding permineralised plants offered a number of the most eminent British palaeobotanists of their day to describe many of the plants. Most of the thin sections were made commercially so that an understanding of the formation of the deposit as a whole proved difficult. The peel technique developed in the 1950s allowed large slices of limestone to be peeled but only small pieces of the peels were ever mounted and studied by the new authors. Large collections (more than 100) of loose blocks on the beach and from <em>in situ</em> from within basaltic lava flows by the author and colleagues from the late 1970s onwards have been slabbed and peeled and provide the opportunity for new studies and an assessment of the plant assemblages and possible communities present. At least 25 plant organ species are present representing more than 13 whole plant species. Of particular significance is the occurrence of the four main lycopsid tree types that dominate later Pennsylvanian peats and the occurrence of five ferns. It is shown also that a number of the plants may also be preserved as charcoal, especially zygopterid ferns such as <em>Metaclepsydropsis</em>. Of particular importance is the occurrence of true permineralised peats that provide evidence of the botanical composition of the earliest peat-forming mire at a time of rapid global change with a sudden fall of atmospheric CO<sub>2</sub> and rise in O<sub>2</sub> that would have also had an effect upon wildfire systems.</p></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"135 4","pages":"Pages 389-415"},"PeriodicalIF":1.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0016787824000294/pdfft?md5=78d2a83e6cb244ec5fe08ce311dcc495&pid=1-s2.0-S0016787824000294-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141615014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0